Thread:Weather Synchronize/@comment-31884817-20170513122036/@comment-34732627-20180228082248

Sorry to break your hopes, but that "cave" is just where you get unique Pokemon and Frost Breath. Though it's a strong reference to Kyurem vs. the Sword of Justice, I hypothesise that it will be a future notable location later on..

As regards to Mewtwo, he isn't in the cave on Route 16, unfortunately. However, since Roria League is yet to be release, it's very likely that the Genetic Pokemon will be added later on.